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    <p>I took a look at your example. Thanks for posting code. Now I understand your issue completely. Before I suggested to change DynamicResource to StaticResource I thought you wanted to only look up once for your DataTemplate.</p> <p>Now I see you wish to keep the instance of DataTemplate alive so TabControl doesn't destroy it when changing tabs.</p> <p>Here is the solution:</p> <pre><code>&lt;Window.DataContext&gt; &lt;local:MainWindowViewModel /&gt; &lt;/Window.DataContext&gt; &lt;Window.Resources&gt; &lt;local:TabContentTemplateSelector x:Key="tabContentTemplateSelector" /&gt; &lt;DataTemplate x:Key="TabitemDataTemplate"&gt; &lt;StackPanel Width="50" Height="50"&gt; &lt;TextBlock Text="{Binding TabFirstPanel.Name}"&gt;&lt;/TextBlock&gt; &lt;/StackPanel&gt; &lt;/DataTemplate&gt; &lt;Grid x:Key="template1"&gt; &lt;Grid.RowDefinitions&gt; &lt;RowDefinition&gt;&lt;/RowDefinition&gt; &lt;RowDefinition&gt;&lt;/RowDefinition&gt; &lt;/Grid.RowDefinitions&gt; &lt;Grid.ColumnDefinitions&gt; &lt;ColumnDefinition&gt;&lt;/ColumnDefinition&gt; &lt;ColumnDefinition&gt;&lt;/ColumnDefinition&gt; &lt;/Grid.ColumnDefinitions&gt; &lt;TextBlock Grid.Row="0" Grid.Column="0"&gt;Name :&lt;/TextBlock&gt; &lt;TextBlock Grid.Row="0" Grid.Column="1" Text="{Binding TabFirstPanel.Name}"&gt;&lt;/TextBlock&gt; &lt;/Grid&gt; &lt;Grid x:Key="template2"&gt; &lt;Grid.RowDefinitions&gt; &lt;RowDefinition&gt;&lt;/RowDefinition&gt; &lt;/Grid.RowDefinitions&gt; &lt;Grid.ColumnDefinitions&gt; &lt;ColumnDefinition Width="200"&gt;&lt;/ColumnDefinition&gt; &lt;ColumnDefinition Width="5"&gt;&lt;/ColumnDefinition&gt; &lt;ColumnDefinition Width="Auto"&gt;&lt;/ColumnDefinition&gt; &lt;/Grid.ColumnDefinitions&gt; &lt;Grid Grid.Row="0" Grid.Column="0"&gt; &lt;Grid.RowDefinitions&gt; &lt;RowDefinition&gt;&lt;/RowDefinition&gt; &lt;RowDefinition&gt;&lt;/RowDefinition&gt; &lt;/Grid.RowDefinitions&gt; &lt;Grid.ColumnDefinitions&gt; &lt;ColumnDefinition&gt;&lt;/ColumnDefinition&gt; &lt;ColumnDefinition&gt;&lt;/ColumnDefinition&gt; &lt;/Grid.ColumnDefinitions&gt; &lt;TextBlock Grid.Row="0" Grid.Column="0"&gt;Name :&lt;/TextBlock&gt; &lt;TextBlock Grid.Row="0" Grid.Column="1" Text="{Binding TabFirstPanel.Name}"&gt;&lt;/TextBlock&gt; &lt;/Grid&gt; &lt;GridSplitter Grid.Row="0" Grid.Column="1" VerticalAlignment="Stretch" Width="5" Height="Auto" ResizeDirection="Columns" ResizeBehavior="PreviousAndNext"/&gt; &lt;Grid Grid.Row="0" Grid.Column="2"&gt; &lt;Grid.RowDefinitions&gt; &lt;RowDefinition&gt;&lt;/RowDefinition&gt; &lt;RowDefinition&gt;&lt;/RowDefinition&gt; &lt;/Grid.RowDefinitions&gt; &lt;Grid.ColumnDefinitions&gt; &lt;ColumnDefinition&gt;&lt;/ColumnDefinition&gt; &lt;ColumnDefinition&gt;&lt;/ColumnDefinition&gt; &lt;/Grid.ColumnDefinitions&gt; &lt;TextBlock Grid.Row="0" Grid.Column="0"&gt;Additional Detail :&lt;/TextBlock&gt; &lt;TextBlock Grid.Row="0" Grid.Column="1" Text="{Binding TabSecondPanel.AdditionalDetails}"&gt;&lt;/TextBlock&gt; &lt;/Grid&gt; &lt;/Grid&gt; &lt;DataTemplate x:Key="TabContentWithFirstPanel"&gt; &lt;ContentPresenter Content="{StaticResource template1}"/&gt; &lt;/DataTemplate&gt; &lt;DataTemplate x:Key="TabContentWithBothPanel"&gt; &lt;ContentPresenter Content="{StaticResource template2}"/&gt; &lt;/DataTemplate&gt; </code></pre> <p>If you just copy past that you will do fine.</p> <p>By the way, just as sidenote for you, destroying and building up DataTemplates is very important in wpf for releasing unmanaged memory.</p>
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    1. COI am sorry. This did not work for me either. Am I missing "TestSelector" code?
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    2. COOh just remove TestSelector... That was just empty selector of mine. I updated the code.
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    3. COI had already tried this by removing TestSelector code. That did not work. The Tab Content only display "System.Winodws.DataTemplate"
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